SW006010 Microchip Technology, SW006010 Datasheet - Page 61

• Manufacturer Part Number: SW006010
• Description: MPLAB 17C SOFTWARE
• Manufacturer: Microchip Technology

Specifications of SW006010

• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: PIC17C
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: MPLAB®
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

 2002 Microchip Technology Inc.
The ALUSTA, PCLATH, BSR and WREG are the registers that absolutely need to be
saved before we branch to the interrupt service function. However, there are other
registers used by the compiler that are worth saving under certain circumstances. The
following is an example that uses the Timer 0 Overflow Interrupt.
#include <p17c44.h>
unsigned char x;
void _ _TMR0()
{
}
void main()
{
// Install interrupt handler for timer 0 interrupt
// Set prescale value for TMR0
// Unmask TMR0 overflow interrupt
// Enable all unmasked interrupts
// Set Port B in o/p mode
}
Install
Timer 0 overflow interrupts. Then the appropriate prescale value, interrupt flag and
global interrupt enable flag are set. The program enters into an infinite loop when it
reaches the
the
displayed on LEDs.
x++;
PORTB = x;
x = 1;
Install_TMR0(_ _TMR0);
T0STA = 0b11100110;
INTSTA = 0b00000010;
CPUSTA = 0;
TRISB = 0;
while(1)
{
// Loop and wait for an interrupt to take place!
}
_ _TMR0()
_TMR0 (_ _TMR0)
while(1)
function where the value of ‘x’ is sent to PORT B and possibly
statement. When Timer 0 overflows, program control goes to
sets the function
_ _TMR0()
Runtime Environment
as the interrupt handler for
apRNOVM^-page 55
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